Management Team

Investigator Experience

Diablo Clinical Research has five clinical investigators
Dr. Weinstein

Richard L. Weinstein, MD Founder

Executive Medical Director, Endocrinologist

As founder of Diablo Clinical Research, Dr. Weinstein has been principal investigator in over 400+ clinical trials and has experience in protocol writing and consultation on protocol design.

Dr. Weinstein, board certified in Endocrinology and Internal Medicine, is the Executive Medical Director of Diablo Clinical Research. He was also the past director of the Osteoporosis Center at John Muir/Mt. Diablo Health Network and the Diabetes Center and Endocrine Section at John Muir Medical Center. He also maintained a private practice, Contra Costa Endocrine Associates, for 30 years.

Many of Dr. Weinstein’s past patients are now part of the research clinic’s database, comprised of over 12,500 subjects. Dr. Weinstein now devotes his time exclusively to clinical research. He has been the Principal Investigator for studies in many therapeutic areas including but not limited to: Diabetes, Type I and Type II, Diabetic Neuropathy, Obesity/Weight loss, Osteoporosis/Osteopenia, Fibromyalgia, Healthy Volunteer/Phase 1, Hyperlipidemia, Women’s Health (hot flash, FSD, etc.), Menopause, Sexual Dysfunction (ED and RE).

Richard Weinstein, MD attended medical school at the University of Virginia School of Medicine. He completed his internship and residency at the Cleveland Metropolitan General Hospital, Western Reserve University. He also completed a Clinical Research Fellowship in Endocrinology at Massachusetts General Hospital, Harvard Medical School.

Dr. Leonard Chuck

Leonard Chuck, MD, PhD Co-Medical Director

Co-Medical Director, Internist

Dr. Chuck has been with Diablo Clinical Research since 2006 as a sub-investigator and in 2007 he became co-medical director of our facility and principal investigator for many of our studies. Prior to joining Diablo Clinical Research, Dr. Chuck was in community practice for twenty years as an internist. Prior to his community work, Dr. Chuck spent ten years as a clinical/laboratory researcher at several major academic institutions: UCLA, Cedars of Lebanon, The Cardiovascular Research Institute at UCSF, The University of Antwerp in Belgium and The University of Calgary. Dr. Chuck also taught in the Physiology Department at UCSF and The University of Calgary.

Dr. Mark P. Christiansen

Mark P. Christiansen, MD Co-Medical Director

Co-Medical Director, Endocrinologist

Dr. Christiansen has been a sub-investigator and principal investigator with Diablo Clinical Research since 2007. He is an expert and specializes in glucose clamp studies. He also maintains his private practice in Pleasanton. Dr. Christiansen has prior clinical research experience in over eight studies including (but not limited to) diabetes type 1 and 2, neuropathy, dyslipidemia, hypertension, metabolic syndrome, fibromyalgia, osteoporosis, osteoarthritis and obesity. Earlier in his medical career, Dr. Christiansen was an Assistant Clinical Physician at San Francisco General Hospital and a staff endocrinologist at Contra Costa Endocrine Associates in Walnut Creek. Dr. Christiansen’s certifications include the National Board of Medical Examiners, the American Board of Internal Medicine, the American Board of Diabetes, Endocrinology and Metabolism and he is a certified Clinical Densitometrist.


Helen Lee Stacey, MD, M.P.H. Internist


Dr. Stacey, a Sub-Investigator with Diablo Clinical Research since 2000, is an Internist with a Masters of Public Health. Before joining Diablo Clinical Research, she had a general internal medicine practice with Muir Primary Care, associated with the John Muir Medical Center. She is past Medical Director of Washington Corrections Center for Women where she developed practice guidelines and implemented standards of care for preventive care and management of chronic diseases. She is also past Medical Director of the Seattle Public Schools Hepatitis B Immunization Project. Dr. Stacey has prior clinical research experience conducting trials of potential HIV vaccines at the University of Washington AIDS Vaccine Unit. She holds certifications from the National Board of Medical Examiners, and the American Board of Internal Medicine.

Dr. Lambert H. K. Chee

Lambert H.K. Chee, MD Cardiovascular

Cardiovascular Specialist

Dr. Chee is a Sub-Investigator for Diablo Clinical Research. His position as Invasive and Interventional Cardiologist held for 20 years at the Diablo Cardiology Medical Group affirmed his expertise in cardiac catheterization and coronary arteriography, percutaneous balloon angioplasty, permanent pacemaker insertion, exercise stress testing and echocardiography, as well as critical care management of patients with cardiovascular problems. He is a laureate of numerous certifications including the National Board of Medical Examiners, the American Board of Internal Medicine and the Subspecialty Board of Cardiovascular Disease. He is a fellow of the American College of Cardiology since 1981.

Management Team

The staff at Diablo Clinical Research represents our core values, which include excellent patient care, valuable study data and community health education.



 Emily Galdes VP and COO

VP and COO of Diablo Clinical Research
  • Over 11 years of experience managing a clinical research facility


Lori Vitti Director

Director of Finance and Administration
  • Over 25 years of finance and administration experience



Charlette Vargas Director

Director of Regulatory Compliance
  • Over 17 years of research regulatory experience



Catherine Morimoto Director

Director of Clinical Operations, CCRC
  • Over 11 years of clinical research experience

Join Us

Diablo Clinical Research, Inc., a private research facility in Walnut Creek, California, is seeking highly motivated and competent individuals who enjoy contributing to high-quality research. At Diablo Clinical Research we conduct Phase 1-4 clinical studies across multiple therapeutic areas, including Diabetes, Diabetic Neuropathy, Obesity, Cholesterol, Migraines, Osteoporosis, Arthritis, Sexual Dysfunction and more.